Edward n



PATENTED JAN. 5, 1904.

E. 'N. TRUMP. APPARATUS FOR DRYING MOIST MATERIAL.

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N0 MODEL.

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No. 748,893. PATENTED JAN. 5,1904. E. N, TRUMP.

APPARATUS FOR DRYING MOIST MATERIAL.

APrLioA'rmx FILED APR". 25, 1901.

H0 MODEL l. 2 SHEETS-SHEET 2.

INVENTOI? Edward Fun Byamiv A ZTOBNEY UNITED STATES Patented January 5,1904.

PATENT- OFFICE.

APPARATUS FOR DRYING M OlST MATERIAL.

SPECIFIGATIQN forming part of Letters Patent No. 748,893, dated January5, 1904. Application filed April 25, 1901. $erial1lo. 67,418- No model.)

To all whom it may concern:

Be it known that I, EDWARD N. TRUMP, a citizen of the United States,residing at Syracuse, in the county of Onondaga and State of New York,have invented new and useful apparatus for drying moist materials,absorbing gases or vapors, or decomposing and driving ofi gases frommaterials requiring such treatment, or other similar purpose, of whichthe following is a specification.

My invention relates to improvements in apparatus for drying moistmaterials, absorbing gases or vapors, or decomposing and driving ongases from materials requiring such treatment, or other similar purpose.

My purpose is to bring a moving currentof gas, air, or other treatingagentinto intimate contact with the material in such a manner as toautomatically separate and discharge the finished material as soon asthe work is complete, at the same time imparting to or extracting fromit"the required amount of heat to extract or impart moisture or gas orto decompose the material. I

The essential feature of my invention is to induce a current of treatinagent which shall act oppositely to the initia movement of the rawmaterial to cause its suspension, but which shall afterward select andcarry off with said current the finished material-for instance,by'introducing the particles of material into anupwardly-moving currentof treating agent of varying velocity, by which it is first suspendedagainst the action of gravity, and as its specific gravity is changed bythe action of the treating agent its position is automatically changeduntil the desired purpose is attained and the material discharged.

Referring to the drawings, Figurel is a view in elevation of myapparatus. Fig. 1 is a plan view below the line 5 5 of Fig. 1 of thestack and blower, showing a rheostatcontrolled electric motor fordriving the blower. Fig. 2 is a detail of the upper part of the stackwith-part of the wall thereof broken away' to show a modification inbafileplate. Fig. 3 is a horizontal section,slightly enlarged, on theline 3 3 of Fig. 1. Fig. 4 is a vertical section of the lower part ofthe table-feed on line A 4 of Fig. 3. Fig. 5 is an elevation of part ofmy device, showing the feed at the top of the stack and also aheating-jacket surrounding said stack. Fig. 6 is a plan view below theline 6 6 of Fig. 5. Fig. 7 is an elevation of the stack, showing meansfor introducing a direct vertical cur rent into the bottom thereof. Fig.8 is a cross-section, somewhat enlarged, of the upper part of the stackas shown in Fig. 7, showing means for feeding the material andarrangement of baffies; and Fig. 9 is a similar view showingmodifications in bafiie and feed.

Similar numerals refer to similar parts throughout the several views.

Referring to Fig. 1, the stack or chamber 1 is disposed vertically withrespect to its longitudinal extension and has a graduallyincreasing areaof cross-section from near the middle portion to the top. The treatingagentis introduced at the bottom of the stack by the fan or blower 2. Itmay be delivered into the stack in a direct upward or vevticaldirection, as would be the case by the construction shown in Fig. 7, orit may be delivered in a spiral tangent to the side, as the result ofthe construction shown in Figs. 1, 5, and 6, which will give it awhirling upward current in a spiral course for the purpose hereinafterstated. The material to be treated may be fed into the stack, eithervertically, horizontally, or inclined, at any suitable point above theentrance of the treating agent or, in fact, in any manner so that thesame will be brought into said current of treating agent.

In the devices shown in Figs. 5, 7, 8, and 9 a vertical feed isemployed, consisting of a funnel-shaped opening provided with agitatorsand a screw 33 or screws 33 and 34 to assure the movement of thematerial into the stack.

In Fig. l I show adeviceemployingatablefeed. (Shown in detail in Figs. 3and 4:.) This consists of the receptacle 3, having a revolving table aat or near its bottom, which cooperates with a blade 5 to deflect thematerial to be delivered through an intake-aperture in the stack. Theblade 5 is adjustable, having a set-screw 7, adapted to cooperate withthe are 8 to change the angular position of the blade to cause it toencounter more or less of the material with each revolution of thetable, as may be desired. The horizontal segment or shield 9 is sodisposed above the intake-aperture of the stack as to prevent thenatural slope of the material from extending beyond the edge of therevolving table and to assure a steady feed that can be controlled orregulated. This also assures a continuous mass of material above theintake-aperture to form a seal over said intake to prevent the escape oftreating agent from the stack. The revolving table 4 is mounted on theshaft 10 and may be driven by any. suitable means operating through thegear 11. The material may be fed into the receptacle 3 through thetrough or chute 12 or by any other suitable means. A plow or scraper 13is secured to the under side of the revolving table and is adapted tofeed into the stack the material that falls into the chamber 14 betweenthe revolving table and the lower edges of the wall of the receptacle 3.

In Figs. 1, 1 5, and 6 I show the means for inducing a current oftreating agent, consisting of a fan or blower 2, delivering tangentiallyinto the bottom of the stack, which causes an upward spiral currentthrough the stack. The fan or blower 2 is driven by an electric motor36, deriving its current from a source 37 and controlled by rheostat 38to regulate the speed of said blower and the consequent velocity of thecurrent induced.

In Fig. 2 the baffle-plate 15 is disposed approximately the exit-pointor outlet of the treating agent and finished material and is adapted tocotiperate in the separation of the finished from the raw material, asin the case of the baffle-plates 15 in Fig. 1.

In Fig. 1 I show a baffle means in which a series of baffles 15 aremounted upon a single shaft and correspond, respectively, to therelative areas ofcross-section of the surrounding stack with respect tothe position of each. The supporting-rod 16 is adapted to be raised orlowered as adjustable means for controlling the passage for the treatingagent and the material carried thereby to the exit 17,

such adjustment being desirable to meet the conditions of the differentmaterials to be treated or the different ways of treating the same.

In Figs. 8 and 9 I show a further modification of baflles where the feedis in the top of the stack and through said baffles, the purpose beingas above described and also to assure the separation of the the incomingmaterial.

In Fig. 9 I show oppositely-disposed baffleplates 30 and 31 with anintermediate baffle 32, through all of which baffles the raw material isfed, the movement of same being assured by the screws 33 and 34. Thepurpose of this arrangement of baffles is to assure the separation'fromthe outgoing material of material that is not perfectly finished ordried. As the said material strikes against the baffie 32 some of it isdeflected over the edges of outgoing from r with the discharge-pipe 17,which leads to the separator 18 of the type known as the cy cloneseparator,which is provided at its base with the conveyer 19 to carryoh. the material separated from the treating agent passing through 18.The separator 18 is also connected with the pipe 20, leading to thedustreceiver or second separator 21. At the bottom of the dust-receiver21 is a second conveyer 22, serving a similar purpose as that ofconveyer 19. The dust-receiver 21 is also connected with the pipe 23,which carries the treating agent, now having been relieved of thematerial treated, downwardly to the heater 24, thence through pipe 25 toblower or fan 2, and back to the stack 1. The dustreceiver 21 is alsoprovided with a valve-controlled exit 26 for releasing such part of thetreating agent as may be desirable, and connected with the heater 24 isprovided a valvecontrolled inlet 27 for the purpose of taking in freshtreating agent as may from time to time be desirable. When gas is used,it is obvious that inlet 27 may be connected with any suitablegas-reservoir or source of gassupply. (Not shown.) A port 28 is providedat the bottom of the stack for the purpose of taking out material thatmay have fallen below the blower or the current of treating agentmaintained thereby by cause of too heavy feeding of material into thestack, or the larger receptacle 29 may be provided, as shown in Fig. 1,forcollecting said material, so that it need only be removed atintervals.

The operation of my device is as follows: Taking, for example,theapparatusconstructed as shown in Fig. 1, the material is fed into thestack 1 at 6 by the table-feed and encounters the current of treatingagent rising from the blower or fan 2. Where the purpose is to dryfinely-divided moist material, the current of treating agent is soregulated that the moist material will just remain suspended in thelower portion of the stack, being kept in motion by said upward current.As its weight decreases by the driving ofi of the moisture in theproduct, which is very quickly accomplished by the intimate contact withthe treating agent, the material ascends toward the top of the stack,and when it becomes quite dry is carried off by the current of treat ingagent through pipe 17 to separator 18. The regulation of the current isaccomplished by the regulation of the speed of the fan or blower 2. Thismay be accomplished, as shown in Fig. 1, by a rheostat-controlledelectric motor or in any other of a number of wellknown ways. Thetreating agent delivered into the bottom of the stack is first heated inthe heater 24 and gives up its heat to the material to be treated and tothe moisture containedtherein to cause its evaporation. It will also benoted that inasmuch as the area of cross-section of the stack is less atits 1 i ing heavier will always seek the larger circle and force the drymaterial away. Thus the lower extension the vertical velocity of thecurrent of the treating agent will be greater there than in the upperportion of the stack,

i moist material at all times for its most efii- 1 cient treatment.current may be appropriately termed an opwhere the area of cross-sectionis greater, and the current of treating agent consequently becomes moredispersed, and thus loses in vertical velocity. By this loss of verticalvelocity of the current, due to its graduallywidening spiral courseconsequent upon the increasing area of cross-section of the stack towardits upper extension, it results that at a certain distance above theintake-point of material the said vertical velocity of the current isinsuificient to support or suspend the raw or wet material, but is onlysuflicient to suspend the drier or partially-finished material. Thepoint at which the current will not suffice to suspend the raw or wetmate-' rial will depend upon the adjustment of the initial speed ofcurrent, rate of feed, and condition of material and the variousrespective cross-sections and longitudinal dimensions of the stack.

As aboveindicated, by the proper adjustment of the above-mentionedfactorsof initial speed of current, rate of feed, and cross section andlongitudinal dimensions of stack a point exists where-the raw or wetmaterial will not be supported by the current; but to be supported atthis point the material must be partially finished or dried. It followsthat as the area of cross-section of the stack increases as the stackascends the vertical force or velocity of the current decreases in likeproportion, and consequently the higher in the stack that the materialis suspended the more completely dried or finished it must be. It willthus be seen that from the point where the current is at first able tosuspend the raw or wet material to the top of the stack there is aconstant and automatic separation of the finished from the less finishedmaterial until the perfectly finished and dry material is delivered atthe top entirely free-from any of the unfinished portions of thematerial. p

The whirling or spiral course of the current of treating agent producedby the construction shown in Figs. 1, 5, and 6 is useful for rent thematerial that has become finished or dried, and especially in case wherethe heating-jacket is used the heavier or wetmaterial is kept in contactwith the hot walls of the stack until it becomes dried or finished,

.when it is immediately displaced by other moist material, since themoist material hespiral current insures the position of the In thisrespect the said erating agent.

A further regulation of thecurrent of' treating agent at the top of thestack may be %secured by the proper adjustment of baffle plate orplatessuch, for instance, as are shownin Fig; l. porting these platestheir peripheries apiproach the surrounding wall of the stack andrestrict the passage therebetween of the treat- Eing agent ladened withthe dry material, such [adjustmentbeiug made to suit the nature of thematerial to be treated. Suitable adj ust- 'ment may also be made betweenthe velocity of the current of heating agent delivered at lthe bottom ofthe stack andthe rate of feed :of material delivered into the stack, theiformer by controlling the speed of the blower or fan 2, as abovedescribed, and the latter either 'by similarly regulating the speed ofthe revolving table t or changing the angu- By lowering the-rod suplarposition of the deflecting-blade 5, or both.

Thus with due regard to the dimensions of the stack the feed of materialand the velocity of the current of treating agent may be exactlyadjusted to the work to be done in :the most efficient way.

As already stated, the dry material is can .ried from the top of thestack through pipe 17 to the cyclone-separatorlS, where the dry materialfalls through the treating agent to the bottom of separator 18 and iscarried 06 by the conveyer 19. The treating agent passes out ofseparator 18 through pipe 20 to the 'dust'receiver 21,,where anyparticles of material that still remain in the treating agent arecollected and carried off by the conveyer 22. The treating agent is thenconducted from the dust-receiver 21 through pipe 23 to heater 24, thencethrough pipe 25 to blower or fan 2 and back to stack 1. In the casewhere moisture is to be carried oil from the material a portion of thetreating agent may be allowed to escape at' exit 26, only a portionbeing taken back to the/heater 24, where fresh air or other treatingagent is added through the inlet 27.

0t coursethe stack 1 in whatever combination used, and whether fordrying, chemical treatment, or other purpose, may be heated, as shownand described in connection with Figs. 1 and 5, and as the material,especially where given a spiral motion, comes in very intimate contactwith the interior surface of the stack the heat. will be transmitted toit with great efficiency and a large product obtained. It is to beunderstood also that any of the feed devices shown or others may be usedin any of the systems shown or the equivalents of such systems, and,further, that any of the various baffle and separating devices or theirequivalents herein shown and described may be used in any of the systemsor their equivalents herein disclosed. 4 As indicated in the firstparagraph of the specification, my invention is intended for the dryingof moist material or for chemically treating material, and in my use ofthe term treating in the following claims I mean thereby either thedrying of material or the causing of some chemical change in thematerial treated, as distinguished from the mere mechanical separationof diiferent particles of a heterogeneous mass, such as the separationof wheat from chafi or any heavier particles from lighter particles.

. What I claim is 1. In an apparatus for treating material, a series ofchambers-forming a closed circulatory system including atreating-chamber, means for continuously feeding into said chamber thematerial to be treated, means for causing an upward current of an agentfor treating the material in said chamber and also for transporting thematerial upwardly through said chamber as it approaches the finishedstate.

2. In an apparatus for treating material, a series of communicatingchambers forming a closed circulatory system, one of which is atreating-chamber, means for feeding material into the treating-chamber,and means for causing an upward circulation through said chamber of anagent to treat said material and so as to separate the finished from theunfinished material.

8. In an apparatus for treating material, a series of communicatingchambers forming a continuous closed circulatory system, means forcontinuously feeding into one of said chambers material to be treated,means for causing an upward circulation of a treating agent through saidchamber so as to operate upon and transport the material, and means forseparating the treated material from the said agent.

4. In an apparatus for treating material, a series of communicatingchambers forming a continuous closed circulatory system, means forcontinuously feeding into one of said chambers material to be treated,means for causing a circulation through said series'of an agent foroperating upon and transporting the material and so as to cause theseparation of the treated material from the operating agent. v v,

5. In an apparatus-for treating material, a

series of communicating chambers forming a.

continuous closed circulatory system, means for continuously feedinginto one of said chambers material to be treated, means for causing anupward circulation through said chamber of an agent for operating uponand transporting the material, means for imparting heat to the operatingagent and means for causing the separation of the treated material fromthe operating agent.

6. In an apparatus for treating material, a series of communicatingchambers forming a closed circulatory system, a treating-chamber, havingits longitudinal extension vertically disposed, as one of said series,means for feeding material into-the treating-chamber and means forcausing a circulation through said chamber of an agent which passesupwardly through the treating-chamber to treat said material and toseparate the finished from the unfinished material.

7. In an apparatus for treating material, a series of communicatingchambers forming a closed circulatory system, a vertical stack as one ofsaid series of chambers, means for continuously feeding into said stackmaterial to be treated and means for causing an upward circulationthrough said stack of an agent to operate upon and transporting thematerial.

8. In an apparatus for treating materials, a series of communicatingchambers forming a closed circulatory system,a vertical stack as one ofsaid series of chambers and means for causing an upward spiralcirculation through said stack of an agent'for operating upon andtransporting the material.

9. In an apparatus for treating materials, a series of communicatingchambers forming a closed circulatory system, a vertical stack as one ofsaid series of chambers, means for causing a spiral circulation throughsaid stack of an agent for operating upon and transporting the materialand means for imparting heat to the walls of the stack.

10. In an apparatus for treating materials, a series of communicatingchambers forming a circulatory system, a treating-chamber as one of saidseries, means for circulating an agent for treating material in saidchamber and also for transporting the material through said chamber asthe material approaches the finished state, means for causing thecirculation of said agent and means for replenishing the circulatingagent.

11. In an apparatus for treating material, the combination of atreating-chamber vertically disposed of increasing area of crosssectiontoward its upper extension and contracted at the top, a conductorleading from the contracted top, a separating-chamber connected with thetreating-chamber by said conductor, conducting means leading from theseparating-chamber back to the lower part of the treating-chamber, meansfor inducing an upward'current of treating agent in the treating-chamberand means for continuously feeding material to be treated into saidagent.

12. In an apparatus for treating material, the combination of atreating-chamber vertically disposed of increasing area of crosssectiontoward its upper extension and contracted at the top, means for inducingan upward current of treating agent through said chamber, means forfeeding material to be treated into said agent and a series ofseparating-chambers connected between the contracted top and the lowerportion of the treating-chamber so that the treating agent may circulatefrom the treating-chamber through the separating-chamber back to thetreatingchamber.

13. In an apparatus for treating material, the combination of a stack, ablower and a feed, said elements being so proportioned and adjustedrelatively as to afiord means whereby an upward current of treatingagent is induced in the stack, the material fed into said current andsuspended therein during treatment and until it becomes finished andthen transported by the agent.

14. In a drying apparatus, the combination of a stack, a blower and afeed, said elements being so proportioned and adjusted relatively as toafford means whereby an aeriform current of decreasing vertical velocityis induced through moist material to suspend the same until dried.

15. In an apparatus for treating material, the combination of a stack ofincreasing area of cross-section toward its upper extension the upperrestricted portion of the stack.

17. In an apparatus for treating material, the combination of a stack ofincreasing area of cross-section toward its upper extension and thencontracted at the top, means for inducing an upward current of treatingagent therethrough, means for feeding material to be treated into saidstack, a separating-chamber, a conductor leading thereto from the upperrestricted portion of the stack and means for conducting the treatingagent from the separating chamber back to the stack.

18. A drying apparatus comprising a vertical stack increasing indiameter with its height, means for causing an upward spiral circulationthrough said stack of a treating agent whereby the material to betreated is suspended in said agent, and is transported upwardly throughsaid stack as it approaches the finished state.'

19. A drying apparatus comprising a vertical stack increasing indiameter with its height, means for causing an upward spiral circulationthrough said stack of a treating agent whereby the material to betreated is suspended in said agent and the finished material separatedfrom the unfinished material and transported from the stack.

20. In an apparatus for treating material, which changes in specificgravity through treatment, means for inducing an upward spiral aeriformcurrent of decreasing vertical velocity to cause the finished materialto be selected from the unfinished material and discharged and means forintroducing the material into said current.

21. A drier comprising a treatingstack, a separator, a heater, and ablower forming together a circulatory system, means for feeding thematerial to be treated into said stack, and means for inducing atreating-current to suspend the material during treatment.

22. A treating-stack, means near the bottom thereof for introducing aspiral current of the operating agent, means for introducing thematerial to be treated into said agent and a baffle near the exit ofsaid stack.

23. A treating-stack, means near the bottom thereof for introducing aspiralcurrent of the operating agent, means for-introducing the.material to be treated into said agent, and an adjustable baffie nearthe exit of said stack. I

24. A drier-stack gradually increasing in diameter with its height, atapering enlargement near the exit of said stack, and a baffie securedadjacent said exit. H

'25. A drier comprising a vertical-stack, means for causing thecirculation through said stack of an operating agent, a port in saidstack, a rotating table, and a blade'supported in proximity to saidtable for deflecting the material to be treated through said port.

26. A drying apparatus comprising a vertical stack increasing indiameter with its height, means for causing an upward spiral circulationthrough said stack of a treating agent whereby the material to betreated is suspended in said agent and is transported upwardly throughsaid stack as it approaches the finished state and means for impartingheat to the treating agent.

27. Means for inducing an'aeriform current of decreasingverticalvelocity through moist material for the purpose ofdrying the same, exitmeans for discharging thematerial when dried, a table-feed fordelivering the moist'material into the current through anintake-opening, and means for maintainiug a superimposed mass ofmaterial as a seal for the material intake-opening.

28. The combination of an upwardly-ex tending stack having increasingarea of cross section in its upper extension, regulatable into the stackas regulatable means for introducing the material to be treated.

29. In an apparatus for treating material, the combination of a stack ofincreasing area of cross-section toward its upper extension, means forinducing an upward current of treating agent therethrough, means forfeeding material to be treated in said stack,a separating-chamberconnected with said stack for separating the finished material from thetreating agent and conveying means connected therewith for carrying offthe finished material.

30. In an apparatus for treating material, the combination of a stack ofincreasing area of cross-section toward its upper extension, means forinducing an upward current of treating agent therethrough, means forfeed ing material to be treated in said stack, a separating-chamberconnected with said stack for separating the finished material from thetreating agent, conveying means connected therewith for carrying 05 thefinished material and conducting means connected with the separator forreturning the treating agent back to the stack.

31. In an apparatus for treating material, the combination of a stack ofincreasing area of cross-section toward its upper extension, means forinducing an upward current of treating agent therethrough, means forfeeding material to be treated in said stack, a separating-chamberconnected with said stack for separating the finished material from thetreating agent, conveying means connected therewith for carrying ofi thefinished material and a conductor and heater connected between theseparating-chamber and the stack for heating andreturning said agent tothe stack.

32. In an apparatus for treating material which changesin specificgravity during treatment, means for inducing an upward spiral aeriformcurrent of decreasing vertical velocity to cause the finished materialto be selected from the unfinished material and automaticallydischarged, means for introducing the material into said current, andexit means below the current for removing the material that may fallpast the influence of the current.

33. In an apparatus for treating material which changes in specificgravity during treatment, means for inducing an upward spiral aeritormcurrent of decreasing vertical velocity to cause the finished materialto be selected from the raw material and automatically discharged, meansfor introducing the material into said current, a chamber below saidcurrent for receiving and containing the material that may fall past theinfluence of the current, and exit means connected therewith forremoving the same.

34. In an apparatus for treating material which changes in specific gravity during treatment, the combination of means for inducing a spiralaeriform current through said material to cause the separation of thefinished from the unfinished material, means for feeding material intothe current through an intake-opening and means for maintaining asuperimposed mass of material as a seal for the intake-opening.

35. In an apparatus for treating material which changes in specificgravity d u ring treatment, a chamber whose cross section increases withits height, means for heating the walls of said chamber,means forinducing into said chamber an upward spiral aeriform current to keep thematerial against the heated Walls of the chamber.

36. In an apparatus for treating material, the combination of atreating-chamber, regulatable means for introducing into the chambermaterial to be treated, means for inducing an upward current of treatingagent so as to continuously suspend the whole mass of material in thechamber during the period of treatment and to transport the same as itbecomes treated, and aseparating-chamber connected with thetreating-chamber for receiving the transported material and separatingthe same from the treating agent.

37. In an apparatus for treating material, the combination of atreating-chamber, regulatable means for introducing into the chambermaterial to be treated, and means for inducing an upward spiral currentof treating agent to suspend the whole mass of material in thechamber-during the period of treatment and transport the same as itbecomes treated.

38. Inan apparatus for treating material, the combination of atreating-chamber,means for introducing into the chamber material to betreated, regulatable means for inducing an upward current'of treatingagent so as to continuously suspend the material in the chamber duringthe period of treatment and to transport the same as it becomesfinished, and a separatingchamber connected with the treatingchamber forreceiving the transported material and separating it from the treatingagent.

39. In an apparatus for treating material, the combination of atreating-chamber, means for in roducing into the chamber material to betreated, regulatable means for inducing an upward spiral current-oftreating agent to suspend the material in the chamber during the periodof treatment and to transport the same as it becomes finished.

40. In an apparatus for treating material, the combination of atreating-chamber, regulatable means for introducing into the chambermaterial to be treated and regulatable means for inducing an upwardcurrent of treating agent so as to continuously suspend the material inthe chamber during the period of treatment and to transport the same asit becomes finished, a separating-chamber connected with thetreating-chamber for receiving the transported material and separatingIIO it from the treating agent and conducting means for returning thetreating agent back to the treating-chamber.

' 41. In an apparatus for treating material, the combination of atreating chamber, regulatable means for introd ucing into the chambermaterial to be treated and regnlatable means for inducing an upwardspiral current of treating agent to suspend the material in the chamberduring the period of treatment and to transport the same as it becomesfinished.

42. An upwardly-extending chamber increasing in area of cross-section inits upward extension, means for introducing into said chamber a spiralaeriform current, means for introducing the material to be treated intothe chamber above the current-intake, means for applying heat to thematerial while in the current, and means for withdrawing the finishedproduct therefrom.

43. An upwardly-extending chamber in creasing in area in cross-sectionin its upward extension, means for inducing an aeriform currenttangential to the wall of the chamber to give it a spiral direction, andmeans for introducing the material to be treated into the chamber abovethe current-in take, and means for withdrawing the finished producttherefrom.

44:. The combination of an upwardly-exsection in its upward extension,regulatable means for inducing an aeriform current into said stack,regulatable means for introducing material to be treated into saidcurrent, an exit above the material intake-point for discharging thefinished product,a cyclone separator connected with said exit, a heaterconnected with the separator, conducting means connecting the heaterwith the stack and valve-controlled inlet means connected with theheater.

EDWARD N. TRUMP.

Witnesses:

GEORGE R001, W. M. HALL.

